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l I <br /> Sequoia 684 Chesapeake Drive Redwood Cly CA 94463 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)92t-4100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Pacific Environmental Group Client Project ID Unocal 0123, Tracy, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Water <br /> Rancho Cordova, CA 95742 <br /> Attention Mike Mitchener OC Sample Group S810250 Reported Oct 30, 1998 <br /> } <br /> QUALITY CONTROL DATA REPORT <br /> i <br />' MTBE Methanol <br /> Industrial Solvent <br /> Method. EPA 8260 EPA8015Mod <br />' Analyst: T Costello TS <br /> Concentration <br /> Spiked: 50 ug/I 8 0 mg/L <br />' LIDS Batch#: VMB1026T ISWLCS2102498 <br /> Date Prepared: 10/26/98 10/24/98 <br />' Date Analyzed 10/26/98 10/24/98 <br /> Instrument I D#. H6 GCV-01 <br /> LC % <br /> Recovery 86 106 <br /> Control Limits: 70-130% 70-130% <br /> MS/MSD iSWBSBSD <br /> Batch#. 9810887-11 102298 <br /> Date Prepared- 10/26/98 10/22/98 <br />' Date Analyzed 10/26/98 10/22/98 <br /> Instrument I D #: H6 GCV-01 <br />' Matrix Spike <br /> % Recovery: 86 108 <br /> Matrix Spike <br />' Duplicate% <br /> Recovery 102 108 <br />' Relative% <br /> Difference. is 00 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LGS%recovery data is used for <br /> 4��ie <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> and are not used to accept or reject batch results <br /> inda C Schneiider <br /> Project Manager/Sacramento Laboratory <br /> S81025O PES <5> <br />